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This mini in-ear digital invisible hearing aids and voice amplifier helps you hear everything you need again instantly and give you a new world. You will hear people talking loudly and clearly and hear birds singing that you imagined before.It enhance the sound volume and makes it convenient for watching movie, enjoying the drama, attending meeting and having class.SPECIFICATION:Max Sound Output: ≥120 dBMax Sound Gain: ≥30 dBTotal harmonic Wave Distortion: ≤10%Frequency Range: 250~3500 hzInput Noise: ≤50 dBBattery: AG3 or A312(Zinc Air Battery)Working Voltage: DC 1.5VWorking Current: ≤4mA.FEATURES:>Brand New and High Quality>Pocket design for portability>Anti-Shock and anti-drop, user friendly design>Super mini size and lightweight, not easily to be seen>Reduce noice, provides good sound quality>Durable and reliable for long time use>Silicone earplugs in 4 sizes fit most ears>Adjust volume to the minimum before wearing>Increase volume gradually to avoid sudden increase in soundPACKAGE INCLUDED:>1*Hearing Aids>1*User Manual>1*Case>2*AC3 Button Cells>4*Units of earplug of different size